Condensed Consolidated Statements of Cash Flows - Duke Energy Indiana - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 2,841	$ 2,550	$ 3,908
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	6,084	5,843	5,663
Equity component of AFUDC	(198)	(197)	(171)
Impairment of assets and other charges	85	434	353
Deferred income taxes	3	(200)	191
Contributions to qualified pension plans	(100)	(58)
Payments for asset retirement obligations	632	584	540
(Increase) decrease in
Receivables	443	(788)	(297)
Inventory	(706)	(476)	(34)
Other current assets	(267)	(1,498)	(1,136)
Increase (decrease) in
Accounts payable	(800)	805	249
Taxes accrued	126	10	284
Other current liabilities	(26)	(153)	(13)
Other assets	914	(1,577)	125
Other liabilities	584	410	95
Net cash provided by operating activities	9,878	5,927	8,290
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(12,604)	(11,367)	(9,715)
Purchases of debt and equity securities	(3,761)	(4,243)	(6,098)
Proceeds from sales and maturities of debt and equity securities	3,824	4,333	6,103
Other	(799)	(727)	(333)
Net cash used in investing activities	(12,475)	(11,973)	(10,935)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	10,028	11,874	9,052
Payments for the redemption of long-term debt	(4,737)	(4,396)	(5,294)
Other	(124)	(130)	(94)
Net cash provided by financing activities	2,351	6,129	2,609
Net (decrease) increase in cash, cash equivalents and restricted cash	(246)	83	(36)
Cash, cash equivalents and restricted cash at beginning of period	603	520	556
Cash, cash equivalents and restricted cash at end of period	357	603	520
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	2,883	2,361	2,248
Cash paid for (received from) income taxes	1	(6)	(3)
Significant non-cash transactions:
Accrued capital expenditures	1,908	1,766	1,325
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	497	137	481
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	669	648	619
Equity component of AFUDC	(10)	(13)	(27)
Impairment of assets and other charges		388	9
Deferred income taxes	91	(64)	34
Contributions to qualified pension plans	(8)	(5)
Payments for asset retirement obligations	81	82	67
(Increase) decrease in
Receivables	(40)	(3)	(33)
Receivables from affiliated companies	(8)	20
Inventory	(93)	(70)	55
Other current assets	138	(3)	(181)
Increase (decrease) in
Accounts payable	(83)	105	76
Accounts payable to affiliated companies	42	(3)	8
Taxes accrued	(26)	34	12
Other current liabilities	128	9	13
Other assets	(69)	(10)	20
Other liabilities	7	13	(15)
Net cash provided by operating activities	1,154	1,101	1,004
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(961)	(877)	(818)
Purchases of debt and equity securities	(68)	(61)	(142)
Proceeds from sales and maturities of debt and equity securities	55	48	65
Notes receivable from affiliated companies	109	(86)	(120)
Other	(66)	(55)	36
Net cash used in investing activities	(931)	(1,031)	(979)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495	67	300
Payments for the redemption of long-term debt	(303)	(84)	(70)
Notes payable to affiliated companies	(178)	435	(131)
Distributions to parent	(259)	(462)	(125)
Other	(1)	(1)
Net cash provided by financing activities	(246)	(45)	(26)
Net (decrease) increase in cash, cash equivalents and restricted cash	(23)	25	(1)
Cash, cash equivalents and restricted cash at beginning of period	31	6	7
Cash, cash equivalents and restricted cash at end of period	8	31	6
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	202	186	194
Cash paid for (received from) income taxes	90	35	56
Significant non-cash transactions:
Accrued capital expenditures	$ 114	$ 122	$ 118